diff --git a/test-requirements.txt b/test-requirements.txt
index aec5dbe71..60f4af5a4 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -7,7 +7,7 @@ openstackdocstheme>=1.18.1 # Apache-2.0
 coverage!=4.4,>=4.0 # Apache-2.0
 docutils>=0.11 # OSI-Approved Open Source, Public Domain
 python-subunit>=1.0.0 # Apache-2.0/BSD
-sphinx!=1.6.6,!=1.6.7,>=1.6.2; python_version=='2.7' # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0; python_version=='2.7' # BSD
 sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2; python_version>='3.4' # BSD
 oslotest>=3.2.0 # Apache-2.0
 stestr>=2.0.0 # Apache-2.0